Patents by Inventor Dewey Harper

Dewey Harper has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Flow and pressure responsive valve
    Patent number: 5137054
    Abstract: A flow and pressure responsive valve which blocks upstream flow in the event of a break in a downstream line. Included is a solenoid valve positioned adjacent an inlet port, a pressure sensitive switch, and a velocity fuse positioned adjacent the outlet port. The pressure sensitive switch is tied to a cavity in common with the solenoid valve. The pressure sensitive switch activates the solenoid valve at a predetermined pressure threshold to permit the fluid to flow through the inlet port. The velocity fuse is calibrated to permit the fluid to flow at a nominal flow rate and when the fluid flow exceeds this rate, the velocity fuse shuts off fluid flow through the outlet port.
    Type: Grant
    Filed: December 12, 1991
    Date of Patent: August 11, 1992
    Assignee: Crystal Fluid Power, Inc.
    Inventor: Dewey Harper